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• 1
Electronic Resource
Springer
Communications in mathematical physics 37 (1974), S. 335-341
ISSN: 1432-0916
Source: Springer Online Journal Archives 1860-2000
Topics: Mathematics , Physics
Notes: Abstract A family of solutions of the vacuum Jordan-Brans-Dicke or scalar-tensor gravitational field equations is given. This family reduces to the Kerr rotating solution of the vacuum Einstein equations when the scalar field is constant. The family does not have spherical symmetry when the rotation is zero and the scalar field is not constant. The method used to generate the new solutions can also be used to obtain vacuum Jordan-Brans-Dicke solutions from any given vacuum stationary, axisymmetric solution.
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• 2
Electronic Resource
[s.l.] : Nature Publishing Group
Nature 226 (1970), S. 339-340
ISSN: 1476-4687
Source: Nature Archives 1869 - 2009
Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
Notes: [Auszug] Islam2 points out that his work implies that the sign in the definition of m(a) (x) is correctly chosen. A change of sign does not affect the geometry or geodesies of particles but makes the sign of the gravitational constant, G, which appears in the particle equations, negative. The inertial mass ...
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• 3
Electronic Resource
[s.l.] : Nature Publishing Group
Nature 216 (1967), S. 1297-1298
ISSN: 1476-4687
Source: Nature Archives 1869 - 2009
Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
Notes: [Auszug] For the model I, Er = Em = 0(10) so that pm RQ = constant, pr R* = constant and for the model II, Er = -Pr/X〉 X-1 = (11) (12) so that Em is greater than zero for all t. As Jacobs points out, the model I is given by Chernin7 in a different form. As far as I know, the first analytical ...
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• 4
Electronic Resource
[s.l.] : Nature Publishing Group
Nature 215 (1967), S. 36-37
ISSN: 1476-4687
Source: Nature Archives 1869 - 2009
Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
Notes: [Auszug] Previous models of the universe based on the “big bang” theory have set various times for the period when the density of matter became equal to the density of radiation. This model sets this limit at about 6.7 per cent of the present age of the universe and has an advantage because it ...
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• 5
Electronic Resource
Springer
Communications in mathematical physics 27 (1972), S. 241-246
ISSN: 1432-0916
Source: Springer Online Journal Archives 1860-2000
Topics: Mathematics , Physics
Notes: Abstract The Plebanski and Stachel and Goenner and Stachel lists of metrics which are solutions of Einstein's field equations, have two double eigenvalues and admit 3-parameter groups of isometries with 2-dimensional spacelike orbits are completed by the addition of metrics which result from the use of a more general metric form.
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• 6
Electronic Resource
Springer
Letters in mathematical physics 5 (1981), S. 105-112
ISSN: 1573-0530
Source: Springer Online Journal Archives 1860-2000
Topics: Mathematics , Physics
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• 7
Electronic Resource
Springer
General relativity and gravitation 10 (1979), S. 61-77
ISSN: 1572-9532
Source: Springer Online Journal Archives 1860-2000
Topics: Physics
Notes: Abstract General properties of Einstein-Maxwell spaces, with both null and nonnull source-free Maxwell fields, are examined when these space-times admit various kinds of symmetry mappings. These include Killing, homothetic and conformal vector fields, curvature and Ricci collineations, and mappings belonging to the family of contracted Ricci collineations. In particular, the behavior of the electromagnetic field tensor is examined under these symmetry mappings. Examples are given of such space-times which admit proper curvature and proper Ricci collineations. Examples are also given of such space-times in which the metric tensor admits homothetic and other motions, but in which the corresponding Lie derivatives of the electromagnetic Maxwell tensor are not just proportional to the Maxwell tensor.
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• 8
Electronic Resource
Springer
General relativity and gravitation 17 (1985), S. 111-132
ISSN: 1572-9532
Source: Springer Online Journal Archives 1860-2000
Topics: Physics
Notes: Abstract This is the first of a series of papers on complex spaces and their use in complex relativity. The basic aim is to develop the theory of complex relativity but only insofar as it helps in obtaining, and understanding, real solutions of Einstein's vacuum equations as slices of complex solutions. In this first paper, specific aims of the whole series are first presented. The basic equations and key entities, which are used later, are presented. The basic relativistic language used is that of Newman and Penrose. Included is a discussion of a number of important properties which arise in the development of the basic equations and key concepts, these properties being mainly ones which are not apparent in standard real formulations.
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• 9
Electronic Resource
Springer
General relativity and gravitation 18 (1986), S. 1275-1290
ISSN: 1572-9532
Source: Springer Online Journal Archives 1860-2000
Topics: Physics
Notes: Abstract In this paper the theory of integrable double Kerr-Schild (IDKS) spaces is examined. The vacuum field equations are shown to reduce to the single equation of Plebański and Robinson [20]. These metrics are given essentially in terms of one potentialH. First-order perturbations ofH lead to metric (gravitational) perturbations of vacuum algebraically degenerate spaces in a direct manner and give results in agreement with those of Cohen and Kegeles [6, 7, 8], Stewart [9], Teukolsky [5], Torres del Castillo [12, 13], and others. Higher-order perturbations ofH are also obtained with the view that, in the limit, these solutions should yield (new) exact vacuum solutions. The success of this construction lies in the (complex) geometric structure of IDKS spaces. This structure induces a natural splitting of the field equations which allows a potentialization of the perturbation (as well as the vacuum metric itself). It also allows massless spin 1/2 and 1 fields to be examined on the IDKS background in a similar manner.
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• 10
Electronic Resource
Springer
General relativity and gravitation 18 (1986), S. 107-136
ISSN: 1572-9532
Source: Springer Online Journal Archives 1860-2000
Topics: Physics
Notes: Abstract Einstein's vacuum field equations are integrated in complex relativity in a major subcase of the class whose Weyl tensor is of the type N⊗N, i.e., when the left and right Weyl spinors Ψ and $$\tilde \Psi$$ are each of typeN. The subcase is the complex equivalent of the real nontwisting case. Five separate families of solutions are found. Three of these are complexified versions of the two families of plane-fronted waves and the Robinson-Trautman real type-N metrics and two are complex solutions which do not have any real slices of Lorentz signature. Before the equations are integrated, the relevant general theory and equations are developed in a tetrad frame which is well suited to the discussion of these and a wider class of complex solutions and is called aleft quarter flat frame. The relationship between this frame and the coordinates used and some other frames and coordinates, including the complexified version of the frame often used for real type-N metrics, is discussed.
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